Down syndrome- Down syndrome can also be called Trisomy 21 and is caused by the third
copy of chromosome 21.The common symptoms of Down syndrome can never be generalized as
they vary from person to person and occur at different stages of life.There are physical symptoms
which can be seen externally or mental symptoms that can only be experienced.
Turner syndrome- Turner Syndrome is one of the rare diseases that affect only women. It is
caused by abnormalities in one of the X-chromosomes, and has a number of symptoms, including
short stature and the presence of a webbed neck. While Turner syndrome symptoms may be
apparent at birth, the condition often isn’t diagnosed until puberty. The characteristic short stature
may be overlooked, and the girl is just presumed to be shorter than average.
Klinefelter syndrome- This syndrome pertains to males who have two or more X
chromosomes. The primary effects are sterility and small testicles which many of the symptoms are
subtle and won’t realize they have it. These symptoms are usually noticed at puberty but is also very
random.
Cri du chat syndrome- This disease is caused by a deletion in the chromosome 5p and is